Enhanced Catalytic Activity of Ti, V, Mn-Grafted Silica Spheres Towards Epoxidation Reaction

Das, D.P.; Parida, Kulamani

doi:10.1007/s10562-008-9697-9

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…The photodegradation of phenol was studied in the aqueous solutions over titania pillared zirconium phosphate under solar radiation and compared with that of the UV-radiation [35].…”

Section: Zirconium Phosphatementioning

confidence: 99%

“…Titania pillared titanium phosphate (TiPO/TiO 2 ) has been used as catalyst for the bromination of phenol by KBr, in the presence of hydrogen peroxide [25] and for the photodegradation of phenol [35].…”

Section: Titanium Phosphatementioning

confidence: 99%

“…Natural phosphate used in our work was obtained from the Khouribga region (Morocco). Prior to use this Pd/ZrPO [41,38] Ni/AlPO [11,12,13,72,73] Rh/ZrPO [42,40,41] Ni/Cu/AlPO [13] Pt/ZrPO [38] Ni/AlPO/SiO2 [12] ZrPO/TiO2 [25,35] AlPO/Al2O3 [20,21, material requires initial treatments such as crushing and washing. For use in organic synthesis, the natural phosphate is treated by techniques involving attrition, sifting, calcinations (900 °C), washing and re-calcinations.…”

Section: -2 Natural Phosphatementioning

confidence: 99%

“… 35. (O 3 PCH 2 CH 2 NR 1 R 2 ) 0.65 ·H 2 O, was used to catalyze the Knoevenagel condensation of benzaldehyde with diethyl malonate or malononitrile and cyclohexanone with malononitrile[31] (Scheme 15).Pyrroles were prepared by condensation of alkyl and aryl amines and 1,4-diketones (Paal-Knorr reaction) using potas-…”

mentioning

confidence: 99%

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Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

Sebti¹,

Zahouily²,

Lazrek³

et al. 2008

COC

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This two part review looks at the uses of phosphate based heterogeneous catalysts for a range of synthetic organic reactions. Many different phosphates are known and have been tested as catalysts in a wide range of reaction types, either as catalysts, or in combination with other species such as zinc chloride or KF. The first section deals with the wide variety of phosphates which have been utilized in organic chemistry, while the second focuses more tightly on catalysts derived from naturally occurring phosphates. In all cases, efficient reactions can be achieved and in many reactions, significant solvent effects have been noted. Of benefit is the fact that relatively benign solvents such as lower alcohols and water are often the most effective.

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“…The photodegradation of phenol was studied in the aqueous solutions over titania pillared zirconium phosphate under solar radiation and compared with that of the UV-radiation [35].…”

Section: Zirconium Phosphatementioning

confidence: 99%

Section: Titanium Phosphatementioning

confidence: 99%

Section: -2 Natural Phosphatementioning

confidence: 99%

mentioning

confidence: 99%

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Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

Sebti¹,

Zahouily²,

Lazrek³

et al. 2008

COC

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“…9) of the VO 2 /CeO 2 sample, treated at 800 C, reveal, in addition to sharp ceria lines, new smaller lines which can be seen at 2q $ 18.33 and 24.06 , respectively [ICDD pattern 12-0757]. 77 It can be stated from these results that no catalyst leaching occurs, and the reaction is really heterogeneous. 21,81 However, once CeVO 4 was formed, the activity for the epoxidation reaction decreased.…”

Section: Catalytic Activitymentioning

confidence: 86%

The effect of redox properties of ceria-supported vanadium oxides in liquid phase cyclohexene oxidation

et al. 2015

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Several VO 2 /CeO 2 based catalysts, with V loadings between 5 and 20 wt%, were prepared by impregnation and subsequently dried, calcined and reduced at 673 K. The structural characterization of these materials was carried out using X-ray diffraction (XRD), N 2 adsorption-desorption at 77 K, UV-vis diffuse reflectance spectroscopy (DR UV-vis) and Fourier-transform infrared spectroscopy (FTIR). Their catalytic activities in the epoxidation of cyclohexene, with TBHP as oxidant and heptane as solvent, were also examined. XRD results revealed a good dispersion of VO 2 species on ceria. FTIR and DR UV-visible spectroscopy techniques indicated that polymeric vanadyl species are present on all catalysts and a crystalline VO 2 phase appears on the 20 wt% vanadium sample. Experimental results revealed that catalyst activity decreases with increased vanadium loading, whereas the epoxide selectivity increased up to 90% when the vanadia loading reached 15 wt%. In the case of 20 wt% VO 2 /CeO 2 , the reaction switched towards a 100% enol, enone selectivity. The presence of CeVO 4 was shown to influence the conversion and selectivity of the reaction.

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Liquid‐Phase Cyclohexene Oxidation with O₂ over Spray‐Flame‐Synthesized La_1−xSr_xCoO₃ Perovskite Nanoparticles

Büker

Alkan

Chabbra

et al. 2021

Chemistry A European J

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La1−xSrxCoO3 (x=0, 0.1, 0.2, 0.3, 0.4) nanoparticles were prepared by spray‐flame synthesis and applied in the liquid‐phase oxidation of cyclohexene with molecular O2 as oxidant under mild conditions. The catalysts were systematically characterized by state‐of‐the‐art techniques. With increasing Sr content, the concentration of surface oxygen vacancy defects increases, which is beneficial for cyclohexene oxidation, but the surface concentration of less active Co2+ was also increased. However, Co2+ cations have a superior activity towards peroxide decomposition, which also plays an important role in cyclohexene oxidation. A Sr doping of 20 at. % was found to be the optimum in terms of activity and product selectivity. The catalyst also showed excellent reusability over three catalytic runs; this can be attributed to its highly stable particle size and morphology. Kinetic investigations revealed first‐order reaction kinetics for temperatures between 60 and 100 °C and an apparent activation energy of 68 kJ mol−1 for cyclohexene oxidation. Moreover, the reaction was not affected by the applied O2 pressure in the range from 10 to 20 bar. In situ attenuated total reflection infrared spectroscopy was used to monitor the conversion of cyclohexene and the formation of reaction products including the key intermediate cyclohex‐2‐ene‐1‐hydroperoxide; spin trap electron paramagnetic resonance spectroscopy provided strong evidence for a radical reaction pathway by identifying the cyclohexenyl alkoxyl radical.

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Enhanced Catalytic Activity of Ti, V, Mn-Grafted Silica Spheres Towards Epoxidation Reaction

Cited by 13 publications

References 33 publications

Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

The effect of redox properties of ceria-supported vanadium oxides in liquid phase cyclohexene oxidation

Liquid‐Phase Cyclohexene Oxidation with O₂ over Spray‐Flame‐Synthesized La_1−xSr_xCoO₃ Perovskite Nanoparticles

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Enhanced Catalytic Activity of Ti, V, Mn-Grafted Silica Spheres Towards Epoxidation Reaction

Cited by 13 publications

References 33 publications

Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

Phosphates: New Generation of Liquid-Phase Heterogeneous Catalysts in Organic Chemistry

The effect of redox properties of ceria-supported vanadium oxides in liquid phase cyclohexene oxidation

Liquid‐Phase Cyclohexene Oxidation with O2 over Spray‐Flame‐Synthesized La1−xSrxCoO3 Perovskite Nanoparticles

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Product

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Liquid‐Phase Cyclohexene Oxidation with O₂ over Spray‐Flame‐Synthesized La_1−xSr_xCoO₃ Perovskite Nanoparticles